Spur gear mechanism having a blocking mechanism

Abstract

A spur gear includes an input wheel, an output wheel, and an intermediate wheel, which engages via a gear with a gear on the input wheel and with a gear on the output wheel. A blocking mechanism is provided on the intermediate wheel which, in a first operating state, permits the transmission of torque from the input wheel to the output wheel and, in a second operating state, blocks the transmission of torque from the input wheel to the output wheel. At least one guide track for the blocking mechanism is formed on the intermediate wheel, the guide track having a radially inner guide wall and a radially outer guide wall. A latching position for blocking the blocking mechanism is formed on the radially outer guide wall.

The invention claimed is: 
     
       1. A spur gear with an input wheel having a first gear, an output wheel having a second gear, and an intermediate wheel having a third gear which engages the first and second gears, wherein a blocking mechanism is provided on the intermediate wheel, which in a first operating state enables a torque transmission from the input wheel to the output wheel and in a second operating state, blocks the transmission of torque from the input wheel to the output wheel, wherein at least one guide track for the blocking mechanism is formed on the intermediate wheel, the guide track having a radially inner guide wall and a radially outer guide wall, and a latching position for locking the blocking mechanism being formed on the radially outer guide wall. 
     
     
       2. The spur gear according to  claim 1 , wherein the blocking mechanism comprises a blocking lever with a locking pin, wherein the blocking lever is arranged so as to be pivotable about an axis of rotation. 
     
     
       3. The spur gear according to  claim 2 , wherein the locking pin engages radially or axially with the guide track and can be locked in the latching position. 
     
     
       4. The spur gear according to  claim 2 , wherein the blocking lever can be fixed opposite a housing of the spur gear. 
     
     
       5. The spur gear according to  claim 1 , wherein the at least one guide track includes a radially inner guide track and a radially outer guide track, the latching position being formed on the radially outer guide track. 
     
     
       6. The spur gear according to  claim 5 , wherein the locking pin is substantially guided by the radially inner guide track in a first circumferential direction of the intermediate wheel and by the radially outer guide track in a second circumferential direction of the intermediate wheel. 
     
     
       7. The spur gear according to  claim 1 , wherein the blocking mechanism comprises a blocking disk in which the at least one guide track is formed. 
     
     
       8. The spur gear according to  claim 7 , wherein a mounting hole for receiving the blocking disk on the intermediate wheel is offset from a central axis of the intermediate wheel. 
     
     
       9. The spur gear according to  claim 1 , wherein the at least one guide track is formed on a lateral surface of the intermediate wheel or a blocking disk mounted on the lateral surface. 
     
     
       10. A level control for adjusting the height of a motor vehicle body of a motor vehicle, wherein the level control can be operatively connected to suspension spring struts of the motor vehicle in order to raise or lower the motor vehicle body, wherein the level control comprises a spur gear with a blocking mechanism according to  claim 1 . 
     
     
       11. A spur gear comprising:
 an input gear wheel; 
 an output gear wheel; 
 an intermediate wheel having gear teeth meshing with the input gear wheel and the output gear wheel, a lateral surface of the intermediate wheel having an inner guide wall and an outer guide wall defining an outer guide track therebetween, the outer guide wall further defining a locking position; 
 and a blocking lever with a locking pin guided by the outer guide track for rotation in a first direction and engageable in the locking position to prevent rotation in a second direction opposite the first direction. 
 
     
     
       12. The spur gear according to  claim 11 , wherein the inner guide wall further defines an inner guide track, the guide pin guided by the inner guide track for rotation in the second direction. 
     
     
       13. The spur gear according to  claim 12 , wherein the intermediate wheel comprises a blocking disk having the inner and outer guide walls and an intermediate gear wheel having the gear teeth. 
     
     
       14. The spur gear according to  claim 13 , wherein a mounting hole for receiving the blocking disk on the intermediate gear wheel is offset from a central axis of the intermediate wheel. 
     
     
       15. A spur gear comprising:
 an input gear wheel; 
 an output gear wheel; 
 an intermediate gear wheel meshing with the input gear wheel and the output gear wheel, a lateral surface of the intermediate gear wheel defining an inner guide track and an outer guide track, the outer guide track including a locking position; 
 and a blocking lever with a locking pin guided by the outer guide track for rotation in a first direction, guided by the inner guide track for rotation in a second direction opposite the first direction, and engageable in the locking position to prevent rotation in the second direction. 
 
     
     
       16. The spur gear according to  claim 15 , wherein the intermediate gear wheel has an inner guide wall and an outer guide wall, the outer guide track being radially between the inner guide wall and the outer guide wall, and the inner guide track being radially inward of the inner guide wall. 
     
     
       17. The spur gear according to  claim 16 , wherein the locking position is defined by the outer guide wall.